Magnetic Loop Antenna Current and Voltage Distribution
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- เผยแพร่เมื่อ 6 ก.ค. 2024
- Demonstration of voltage and current distribution in magnetic loop antennas.
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Magnetics by Applied Science - • Engineering magnetics ...
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Love to see that you are starting to do videos again!
This was a great demonstration!
@@madscientisthut Thanks!
Man, I wondered... I thought it was TH-cam doing their stupid unsubscribe thing again.
@@jeriellsworth Can you tell me why my Anker 15600 mAh USB battery charger/battery pack is shutting down when attempting to power my MLA-30 Active Loop Antenna??? Is there a simple cure to this dilemma? Thanks
Cool way to visualize the IV distribution.
Made one of these loops with good results, but I'm not sure if larger loop should be earthed.
That's a wonderful demonstration of voltage and Current distribution around a single loop MLA. Very well done to you Jeri and thank you for your contribution to educating all the young (and not so young) Radio Amateurs and would-be Physicists out there.
Nice to have you back and making content again. You have been a great inspiration in the past!
This entire concept was completely new to me, this is so awesome! :D
Really appreciate your videos .. I remember watching the video where you spoke about the beginning of your electronics journey and I should say it was amazing! Keep inspiring!
Love that you are doing video's again. You got me in to electronics.
Over 50 years since I was taught this. Your explanation is so great. Really liked the copper capacitive plates to get the neon to strike! Coooool!
Your videos are a treasure trove of unknown , rarely talked about topics mam!
I've been trying to understand the mag loop antenna for a while now (studying for my Amateur Extra class license!) you explained it so well with awesome visual aid's! Thank you!
Very glad to see two videos so close together. I am happy to listen when you are sharing your vast knowledge.
Good to see you back to making videos again. Like so many others I've missed you.
My favorite nerd you are, also very easy on the eyes with a great voice and brilliant too. Thanks for another magloop vid. 73
I am new to amateur radio and this is seriously cool stuff right there! Thank you for sharing!
As always, a beautiful presentation; such a simple but clever way of showing the voltage distribution. You have such a profound understanding of how antennas work that your videos always illuminate more than led's ! Many thanks
I really enjoyed the very straight forward explanation, and the innovative way you made it visible.
Thank you! Glad to see you again. Always look forward to seeing what kind of project you're into!
I forgot how much i love your channel.
This is so cool! Thank you for posting videos again, Jeri!
Best demo on this topic I've ever soon. Well done, thank you.
Jeri - You are absolutely awesome and I am always looking forward next postings.
It's so awesome that you're doing videos again. God bless you and everything you put your hands to.
Nicely demonstrated! I always thought antennas were very complex, but you make the complex easy to understand. Keep it up!
Very happy to see you back in video land!
Hi Jeri, its a long time, that you want be here with a new electronic video. I only saw your fantastic AR glasses. I'm glad to see you gain. Nice and learning video.
Dont stop.
Stanislav, Slovakia, Europe
Happy to see you back on TH-cam!
Glad to see another video from you. We've all been waiting for the Part 2 video of the 160/80 meter magnetic loop...
Nice short and sweet video showing the current/voltage distribution on a loop antenna.
Glad to have you back producing new content, thanks Jeri :)
so nice you are back... i saw all your old videos! welcome back!
I am glad to see you again!
Wow! What a fantastic way to show how this antenna actually works. Thanks for doing this.
Awesome demonstration, please more similar videos!
I have been missing class with regards to magnetic loop antennas. Thanks for the video, this inspired me to go read.
This was a very interesting demonstration. Well done. I also look forward to the rest of the story on the 80 meter loop. Thank you.
Glad to see you are creating more videos once again, thank you.
Good to have you back my queen
Good to see you making videos again! We've missed you
Came for the utter cuteness, learned something in the process. THANKS!
So glad to see you're making new vids!
Good to see you again and great video!
Absolutely fantastic series of videos , well explained with great demonstrations !
Thank you. Got a little flashback to the time when they allowed CB radios to be connected to home made antennas here in germany in the 90's.
Up until that time we were all stuck with lambda1/2 or 5/8 fishing rods with radials.
Before anyone could say "10W EIRP" i started experimenting with different antennas, feeds and tuning improvements.
If i recall correctly, You still have better than rest of the world and can use packet radio via CB?
You can connect "Signalink" to CB and exchange e-mails legally?
Am I correct?
Last time i checked it was illegal to transport information from a telephone/modem based public network to PR or vice versa. But.... last time i checked was 1999.
And also... as long as you do not cause major fuggubulations you can do what ever you want. There is just no one willing to go after you because your signal is 0.5kHz too wide or simething like that.
Shortwave is just no gov estate anymore... they all fell for the micowave hype ^^
Great to see you back on the Tube. 73
Greetings from Sweden! 🇸🇪
You, lady, just got yourself a new subscriber 🎉
missing a thunderclap at the end... great to see you posting videos again, welcome back!
I know this video's old now, but this is so cool!! I didn't know that you're an amateur, that's so sick!! I am so inspired by the work you do in games and everything else!!
Jeri, you are an inspiration to us all, young and old. Thank you. Tom - K1TA
I've been waiting for video about loops for long time.
Thank you!!!
Nice! Good to see you posting again
Jeri Ellsworth, Simone Giertz and Tom Scott uploading videos on the same day, this is a good day.
I just discovered your channel. What a fantastic resource. Hope you can get back to making these awesome videos soon.
Nice video! The first thing I did after watching was to hit the subscribe button. I will look forward to seeing many more from you.
Fantastic demonstration, congratulation!
Nice visualization method. I've always built loops with the cap at the bottom. Mostly for construction convenience. I've had a fair number of people comment on my vids that the cap should be on top since the most radiation is on the cap side. I would think the bulk of the field is going to be around the current peak, as you see with dipoles. Just my gut instinct though.
I've experimented and it *feels* like the radiation is stronger around the coupling loop. I still make plenty of contacts on them and that's what counts.
I've done a few small loops for fun. Building one out of junk box parts and winding it on an old milk crate. Made contacts on them QRP as well.
You ought to set up WSPR and beacon on the small loop a bit at half a watt just to see who picks you up. You might be surprised. I've found with my 7300 that if I turn the power down to "0" percent, it seems to be about half a watt still coming out.
By the way, I'm going to Quartzfest this year. Maybe I'll see you there. It would be neat to get all the you tubers present together for a group photo we could all use on our channels. :-)
I think the loop would radiate the most around the coupling loop because the current is the highest. I need to do a dipole test to compare the amount of current near the end VS near the cap on the mag loop. I'm so excited that you're going to QuartzFest!!! Randy is going. We need to coordinate a few youtuber events during week.
It is a MAG loop and magnetism is generated only by current. Where the current is strongest so is the magnetism. The electric field will be vertically polarized and the magnetic field horizontal when the plane of the loop is vertical.
Jeri, you have a gift of training, your the best!
In the back of my mind I knew about the voltage potential from working on linear amps back in the late 70's but it makes it easier to understand visually
I have no clue what you are talking about most of the time, But I can't stop watching .
me too
I wish all women were this nerdy, we’d have have that alqubierre-white drive in place and traveling the galaxy already.
You`re in luck, she thinks copper pipe looks cute.
Ashley Clarke but oh on paper it’s poetry.
Visible evidence of the distribution, brings the theory to life. Thanks for this. 73, Paul, VE3EBY.
I love it...a female DX'er.
I'm just a shortwave listener...but have made a few different types of antenna for a hobby. My radios of choice are an old large 3 SW band mantle radio (more like close to being a table version), and the other a Sangean ATS505. Both great radios, but the mantle radio belonged to my Mum and Dad, so sentimental. Had a radio tech friend get the old radio going again, this year. Needed a couple of parts, but he was impressed how clean it was inside. Dad being a rad tech in the airforce always kept the inside of it clean. But I haven't been able to use it since he died in 2013. But amazed how well with my indoor frame antenna, how well it is picking up distant foriegn stations....life in the old girl yet. I think it will keep going longer than me....lol.
Yes your one of my favorite nerds... rf nerds have always been one of my favorites. 😉😀
Great Demo - A picture is worth a 1000 words - keep it Up, All the best in 2019
Excellent video. I have never understood the relationship of voltage and current in RF. The idea of a short solid copper conductor having different potential along it is alien to me.
I almost forgot I was subbed to you, good to see you back. From the thumbnail I thought you had a magnatron at the bottom, lol. Then I realized it was a variable capacitor once the videos started in full screen. Nice visual demonstration of power distribution.
Fascinating ! Thanks ! Just got a Magnetic Loop on order. Really interesting
It is truly great to see new videos uploaded from you again! 73 DE Alex N7LTH
Welcome back Jeri!
Excellent! I remember CB people in the seventies putting neon bulbs at the tip of their antennas and when they keyed the the mic to transmit they would light up. Now I know why!
Jeri, you make some of the best videos.... the stock car roll cage was really good. Nice welds too. 👍
That was brilliant. I've had a RF burn, transmitter, 5W, tuning cap contact. They need a better name than burn. Burn just doesn't describe it. It hurt less than a 'normal' burn but did far more, deeper, damage than tapping a soldering iron would.
Fantastic demonstraion ! Thank you !!!
u re huuge inspiration... made me to invent an inverter and start my company ... Thank u
Thanks for a great illustration of the magnetic loop antenna! Hope to see more videos from you.
73 de KV7M
Thanks Jeri for a great video!
I really like the idea of using morse code button thingy as a switch for controlling power, cool vid Jeri! :)
FYI, the "thingy" is called a KEY. Now I need to brush up on my CW !
Thanks Alot Jeri for making this wonderful video on magnetic loop antenna..
For me you are the best RF & Physic Teacher - thank you (Looking Forward for your 2.Part of your 80m Loop) 73 de DL1LAJ
Thanks!
Great demonstration! Thanks.
Informative, simply stated, imaginative experiment. Thank you for sharing.
This was great; always wanted to see this demonstrated. Who needs a Xmas tree - when you have lights on your mag-loop, lol. Thanks!!!
If the neighbors insist on putting up Xmas lights I should be allowed to put up a giant mag loop with LEDs/
@@jeriellsworth Yep, at least when yours blink it means you're actually talking to somebody far away and doing something very useful. 👍
Great demo, thanks. Carl
Outstanding demonstration. Thank you.
You have such an amazing mind.
This is awesome to have RF visualized in a Mag Loop !!
I'm deaf but love to 'see' waves ! :)
I wish you were one of my teachers at school . I would have had a much better start in life .
Great Jeri. This was visually very cool Demo ! . Now, I want you to know that I am definitely not a stranger when it comes to loops. My current favorite loop is an 80 meter full wave loop, fed by open window wire 450 ohm, I have a decent quick MFJ tuner, and its really fun, and quite unpredictable at times. I could hear a station with a call , D4C the other day. I typically (lately) run a 10 watt radio, possibly less (4w) on 15 meters which is where I heard that station, and actually got a contact with them !. And an eQSL !
I love the leds and neons on that antenna. I'd like to try it at the "maker fair" (we just had our first at the local shasta county fairgrounds). I'd do it because its so visual !
I'd also like to invite you to get on a repeater system where there are more engineers than people lol. I'm a former broadcast engineer, and there are many in the bay area and all over California and Oregon on this system. Primarily UHF but it does have some VHF repeaters. Its called the CARLA network and its connected to the OREGON CONNECTION which takes it to Washington. Also Tahoe and REno. Its a little more complex than most collections of repeaters but doesn't have a "rag chew" . We hope for no longer than 10 minute QSOs most of the time. CARLARADIO.NET for more info. Thanks for that video, I'll try one, even have the Neons which are very useful in this age of leds.
So, Question, have you tried the LEDs on the 160/80 meter loop ? And or the Neon's ? N6GRG
You should invite Bigclive...
He's taught me more than most, excluding
Your wise words of wisdom so many years ago...
"If you want to learn electronics you have to fail"
I felt better about my learning curve, and didn't quit. Thanks Jeri.
Welcome back!!
Glad you are making more videos
Thank you for nice video Jeri!
In the 60's, dad would take us on road trips...mostly at night. I remember seeing the towers with red blinking lights way out in the countryside and imagined invisible voices streaming through the air. I always wondered which one was talking to our car radio.
Awesome! Looks like something out of an AARL handbook 👌 You are a very resourceful interesting smart lady kudos to you! I respect that and keep the vids coming! 👍
Great demo!
nice demonstration!
I love me some LOOP antennas. Compact, null noises, good gain, with reception from sky or horizon.
Very good. Given that the loop circumference is so small compared to Lambda, the current in a mag-loop does not vary much. The E-field is almost entirely contained in the loop capacitor and therefore the near-field is almost purely magnetic. This is why mag-loop antennas are much less affected by nearby structures - especially metal - and it is a great indoor antenna. Gas discharge bulbs need a high "ignition voltage" but stay on with a much lower voltage.
Amazing video again. Thank you very much for the presentations.
73" from Poland de SQ4CTK
Having the knowledge to teach me something is so incredibly attractive. Nice to see you back and great demonstration. KF7MBK
Very very well Jeri !!!!
People like you are very few on earth, don't forget it.